How will users be notified when subscription price increased?

Hi - has anyone here done a price increase for your in-app subscription (even for existing subscribers)? The documentation from Apple mentioned that the App Store will notify customers a few days prior to the renewal date, but it didn’t mention exactly how the customer will be notified - by email, push notifications, in app pop-up, etc. Does anyone have experience on the customer flow of the pricing increase? Does the app need to do anything to ensure user knows to re-subscribe? Thanks in advance for any insights!